@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;700;900&display=swap');

:root {
    --primary-color: #D4AF37; 
    --bg-dark: #0b0b0b;
    --card-bg: #161616;
    --sidebar-width: 260px;
    --sidebar-collapsed-width: 80px;
}

body { 
    background-color: var(--bg-dark); 
    color: #fff; 
    font-family: 'Inter', sans-serif; 
    margin: 0;
    overflow-x: hidden;
}

/* Sidebar */
#sidebar { 
    width: var(--sidebar-width); 
    height: 100vh; 
    position: fixed; 
    background: #111; 
    border-right: 1px solid #222; 
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1050;
    display: flex;
    flex-direction: column;
}

#sidebar.collapsed { width: var(--sidebar-collapsed-width); }

.brand-logo { 
    padding: 30px 20px; 
    border-bottom: 1px solid #222;
    white-space: nowrap;
    overflow: hidden;
}
.brand-logo span { color: var(--primary-color); font-weight: 900; }

.nav-link { 
    color: #fff; 
    padding: 18px 25px; 
    font-weight: 700; 
    text-transform: uppercase; 
    font-size: 0.75rem; 
    display: flex;
    align-items: center;
    text-decoration: none;
    transition: 0.2s;
}

.nav-link i { min-width: 35px; font-size: 1.4rem; }
.nav-link:hover { color: var(--primary-color); background: rgba(212, 175, 55, 0.05); }
.nav-link.active { color: var(--primary-color); border-right: 4px solid var(--primary-color); }

#sidebar.collapsed .link-text, #sidebar.collapsed .brand-logo h4 { display: none; }
#sidebar.collapsed .nav-link { justify-content: center; padding: 20px 0; }
#sidebar.collapsed .nav-link i { margin: 0; }

/* Content Area */
#content { 
    margin-left: var(--sidebar-width); 
    padding: 40px; 
    transition: all 0.3s ease;
}
#content.expanded { margin-left: var(--sidebar-collapsed-width); }

/* Cursos Grid */
.card-course { 
    background: var(--card-bg); 
    border: 1px solid #222; 
    border-radius: 20px; 
    overflow: hidden; 
    transition: 0.4s;
    cursor: pointer;
}
.card-course:hover { border-color: var(--primary-color); transform: translateY(-8px); }
.card-course img { height: 220px; width: 100%; object-fit: cover; filter: brightness(0.6); }

.course-title { font-weight: 900; text-transform: uppercase; color: var(--primary-color); margin-top: 15px; }
.course-desc { color: #aaa; font-size: 0.9rem; line-height: 1.5; }

/* Modal */
.modal-content { background: var(--card-bg); border: 1px solid #333; color: #fff; border-radius: 24px; }
.price-tag { background: rgba(212, 175, 55, 0.1); border-left: 4px solid var(--primary-color); padding: 20px; border-radius: 8px; }

/* Bloqueo */
.bloqueo-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.98); z-index: 10000;
    display: flex; align-items: center; justify-content: center; padding: 20px;
}

@media (max-width: 768px) {
    #sidebar { left: -260px; }
    #sidebar.show-mobile { left: 0; }
    #content { margin-left: 0 !important; }
}